Litain



y 1933- c. SCHNEIDER El AL 1,911,586

GAS PRODUCER Filed Nov. 19, 1928 Fig.1.

Franz SaZeZ A INVENTOR s BW'M TTORNEYS Patented May 30, 1933 UNITED STATES PATENT OFFICE CHRISTIAN SCHNEIDER AND FRANZ SAIBEL, OF NEUROESSEN, GERMANY, ASSIGNORS TO I. G. FARBENINDUSTRIE AKIIENGESELLSCHAIT, OF FRANKFORT-ON-THE- MAIN, GERMANY, A CORPORATION OF GERMANY GAS PRODUCER Application filed November 19, 1928, Serial No.

Thepresent invention relates to gas producers having a stationary grate and 9. r0- tary scraper removing the solid ashes by the action of the scraper through one or more ash holes in the middle of the grate.

A great variety of grates and ash discharging devices are known in connection with gas producers which are operated with fuels tending to form clinker or which are rich in ash constituents. Complete removal of the residues has to be ensured in conjunction with the best possible distribution of the gasifying agent, air or steam. Thus, for example, the employment of a traveling grate has been proposed, which is specially adapted for removing ashes from and supplying air to producers which are operated on the principle of an eddying movement of the fuel bed.

We have now found that the ashes in gas producers with stationary grates and rotary scrapers can be removed eflicaciously by adopting an arrangement for directing the said residues toward one or more central ash holes by the action of the scraper.

For example, a scraper may be employed which has small obliquely disposed blades and is preferably actuated from below through the ash hole, the rotary movement of said stirrer slowly pushing the clinkers and ash towards the centre, where they can be continuously or intermittently drawn offthrough a central pipe.

The accompanying drawing shows in vertical section in Figure 1 and in plan in Figure 2 an example of an arrangement according to this invention, but the invention is not restricted thereto. The hollow, preferably water-cooled, scraper a, a, is actuated fromibelow by means of the hollow shaft 7) and pinion gear 0, its rotational speed being regulated according to the dimensions and output of the producer, the speed being, for example, 0.5 to 1 metre per minute for a circular gas producer with a diameter of 1.5 meters. Small obliquely disposed blades push the ashes towards the central ash hole (Z, where the ashes are drawn off through a pipe 1'. The gasifying agent, air and/or steam, is passed by pipes g and 2' 320,407, and in Germany November 22, 1927.

to belowv and through the grate and thus does not come into contact with the ashes. The hollow scraper a may be cooled by means of a cooling medium passed through it. The cooling medium is supplied by pipe is and through the hollow shaft b into the scraper and leaves the latter by a passageway formed by a tube It surrounding the hollow shaft and is drawn off at Z. driving mechanism for the shaft and scraper consists of the gear a which is driven by an electro-motor by means of a connectlng gearing.

The drawing shows a fiat grate, but it may also for example, be slightly dished in the shapejof a hopper, the ash hole being situated at the lowest point. The arms of the scrapers must, in this case, be adapted to conform to the shape of the grate. The height of the scraper arms above the grate can be adjusted as desired by raising or lowering the shaft h on which they are mounted.

The scraper may also be constructed without the small, oblique blades, as for example when fuel of the producer charge offers an undulyhigh resistance, the essential point being that the design of the scraper be adapted to push the ashes and residues towards the ash hole.

In comparison with gas producers provided with a stationary'grate and a rotary scraper from which the ashes are removed through the grate itself or over its border, the above described construction has the great advantage that the ashes can directly be removed from the producer without com ing into contact with the inflowing gasifying agents, whereby any further formation of clinkers is avoided. Since the grate is inserted into the side walls of the producer without interruption which is necessary when removing the ashes over the border of the grate, the obnoxious formation of fire at the border of the grate which greatly diminishes the quality of the gas produced, is avoided, and the producer can be constructed more safely. By the construction according to the invention also the losses of ash holes.

The

Producers of the herein described kind are particularly suitable for the production of produceror water-gas from small sized carbonaceous material in accordance with the process described in the U. S. Patent No. 1,687,118, in which the air as well as the steam, if such be employed, are blown into the gas producer at such a velocity that the whole fuel is set in an upand downward whirling motion. I

'What we claim is 1. In a gas producer, a stationary grate closely joining the side wall of the producer andlprovide'd with a central opening, a pipe passing into said opening, a rotatable shaft within said pipe, a scraper rigidly mounted on said shaft rotatable above said grate and adapted to push, ashes through said central opening into said pipe, a mechanism for rotating said shaft and scraper, and means for supplying a gasifying agent to below and through said grate.

2. In a gas producer, a stationary grate closely joining the side wall of the producer and provided with a central opening, a pipe passing into said opening, a rotatable hollow shaft within said pipe, a hollow scraper rigidly mounted in said shaft rotatable above said grate and adapted to push ashes through said central opening into said ipe, means for passing a cooling me ium through said hollow shaft and said hollow scraper, a mechanism for rotating said shaft and scraper, and means for supplying a gasifying agent to below and through said grate.

In testimony whereof we have hereunto set our hands.

CHRISTIAN SCHNEIDER. FRANZ SABEL 

